Rotary hydraulic pump and booster pump



April 10, 1956 w. wl-:MHNER ROTARY HYDRAULIC PUMP ANO BOOSTER PUMP 4 Sheets-Sheet l Filed April 28, 1951 April l0, 1956 w. WEMHNER ROTARY HYDRAULIC PUMP AND BOOSTER PUMP Filed April 28, 1951 4 Sheets-Sheet 2 April 10, 1956 w. WEMHNER ROTARY HYDRAULIC PUMP AND BOOSTER PUMP 4 Sheets-Sheet 3 Filed April 28, 1951 fag. .5

///.F/ @Y m April 10, 1956 w WEMHNER 2,741,188

ROTARY HYDRAULIC PUMP AND BOOSTER PUMP Filed April 28, 1951 4 Sheets-Sheet 4 l f \\I\ f l 10? l- `9\l 5;. E

4( /f I J I I 445 VIYri 406 l I E :I l/ s fj V Pill/zn' \K\ 425 724- 40g 421 116 774 41a 106 ma: f a? /Z 23 f7 /f/ n/c 07 ,05 /WM/c z/,W Z/ 24 FRESH ,f FLu/D ,95 F, 5 /07 lfm' PUMP a 5 ,l 2.9' Zig 737 .fm/@non Heer/r United States Yattent 2,741,138 ROTARY HYDRAUIIC PUMP AND BoosrER UMP Wilhelm Wemhner, Berlin-Nicolassee, Germany, assignor to Fritz Spierig, Hamburg, Germany Application April 28, 1951, Serial No. 223,491 Claims priority, application Switzerland May 1, 195i) Claims. (Cl. 103-162) 'The present invention relates to a rotary hydraulic pump and booster pump, which mayk operate, for example, with oil.

lt is the main object of the present invention to provide -an improved rotary hydraulic pump and booster pump, which is so constructed that a desired quantity of used -driving agent can be replaced by fresh driving agent, for example oil, during the operation of the pump.

ln accordance with the invention there is provided a pump, which preferably is driven by the cylinder of the driving mechanism, and which supplements automatically a portion of the driving agent employed in the driving mechanism. According to the invention, this pump is constructed as an eccentric pump, which by means of two control valves, which may be in the form of ball pressure valves, is connected with two pipe lines, which in turn are connected with the intake and discharge of the driving mechanism. In the intake or discharge of the driving mechanism there is provided anautomatically operating double valve, which is actuated alternately dependent on the pressure of the driving agent, and by means of which,

vaccording to the pressure prevailing in the intake or discharge, driving agent, for example oil, is discharged from one or the other pipe line, whilst at the same time, by means of the pump, a similar quantity ofV driving agent, for example cleaned and cooled oil, is added.

1n order that the invention may beprnoreclearly understood anembodiment thereof willvnow be described by way or example with referenceV to the accon'ipanying` drawing, in which Fig. 1 is a vertical longitudinal section through ahydraulic pump according tothe invention.

Fig. la illustrates the details of a component of the apparatus or" Fig. 1.

Fig. 2 shows an embodiment of pump together withrits connection lines within the casing ofthe driving mechanism.

Fig. 3 is a cross-section substantially lalong the line 3f3 of an embodiment of the pump according to jFig. 2 including the complementary parts omitted on theV upper right hand side of Fig. 2.k Fig. 3 may further be used in conjunction with section v.1f-3' of Fig. l. Y

Fig. 4 is a cross-section through an automatically acting double control valve.

Fig. 5 diagrammatically illustrates a complete circuit including a pump.

In Figs. l and 2 there is shown arcasing 4, which may be, for example, in the form of a trough and can be closed by a cover S by means of screws 6. ln ball bearings 7 Vand S there is mounted to be rotatable, for example by the use of flanged bushes 9,-and 1t),V a shaft 11, which on the lefthand side of Fig. 1 iscontinued in -the form of a hollow shaft 11a and which can be driven-mechanically or electrically.

On thisshaft 11-there is arranged a-cylindrical casing, which is designated-generally '12 and possesses aplurality of v.cylindrical .passages '13,; each of .which is` divided -by -fashion by way ofthe rods 12S and 129.

means of a middle partition in the form of a bearing bush 14 into two halves. In each half there is mounted a plunger 15, 16, the one of which 15 is furnished with a central rod 17, whilst the other 16 is provided with a bush 18, in which there tits the rod 17 of the plunger 15. if desired, a spring may be provided between the parts 1'7 and 1S.

Connected to the casing 4, 5 is a further casing 19 having an intake 26 and a discharge 21, or vice versa, for a liquid or gaseous driving agent. The pipe 26 communi- Cates with a line 22 of annular cross-section, whilstthe pipe 21 is connected with a normal pipe line 23. The lines 22 and 23 are provided in a stationary shaftmember 24, which is tted in the hollow portion 11a of the shaft 11. The pipes 22 and 23 are in operative connection with the cylinder chambers 29 and Si), or 29a, 39a, etc., by means of slots 25, 26 provided in the shaft 11 and in the wall of the cylindrical casing 12. Upon rotation of the cylindrical casing 12 and the shaft 11 the pipes 22 and 23 are caused, in rhythm with the cycle of operations, to register alternately with the slots 25 and 26 for the purpose of supplying or discharging driving agent.

The plungers 1S, 16 have cup-like bearing portions 31,

32, or 31a, 32a, etc., which are capable of being engaged 'recesses are provided in bearing cups 41, 42 in a number to agree with the number of cylinders. Fihe cups 41 and 42 are arranged by means of ball bearings L13 and .44 in supporting bearings, which are designated quite generally 4S and 46. The supporting bearings i5 and 46 are each furnished with axle members 4-7 and 43, which are mounted in oscillatory fashion in suitable bearings in the cashing 4, 5. The supporting bearings 45 and 46 yare connected together in jointed connection by means of control rods Se, which are adjustable in iength, for example by means of ser w threads 56a and a and nuts Sb and b (Fig. la). Altogether there are four of these jointed connections with fourk control rods between thesupporting bearings 45 andt.

The four jointed rods 56 form a paralielogram and the adjustment provided thereon serves for ensuring parallelity. The two solid rodsr 12S, 129 are slidably guided in the cylinder 12 which is rotatable together with the shaft 11, for conjointly moving the cups ,41 and 42 in a positive fashion. During adjustment of rods 56 relative movement of bearingl plates d5, t6 is not prevented because the rods 12%, 129 are independent of such adjustment, see especially Fig. 3.

The shaft 48 is passed out of the casing :'S and carries a control rod 57 withhandle 58. AAs shownrby Fig. l, the planes of rotation of the supporting bearingsri and do are situated in each case in the piane connecting the points of rotation of the spherical heads 37 and 37a or 3S and 38a of the control rods 33, 345., or 33a, 34m, and pass through the centralaxis of rotation or 'the rotating cyiinder. ln order Vto obtain a positive movement Iot the cups 41 and 42 together with the rotating cylinder there are provided in the cylinder two longitudinal slots 126 and 127 (Fig. 3), in which are arranged rodsv 128 and 129 carrying at their ends (not shown) spherical heads 128a, which engage in corresponding spherical recesses provided in association with the cups di and di. inthis way itis accomplished that upon rotation of the cylinder 12 the cups 41 and ft2 are conjointly moved in positive in the case of-displacement of the-supports 4S andV 46 for the cups in Fig. 2.

41 and 42 and upon rotation of the cylinder the rods 12S and 129 are able to slide axially and radially in their slots 126 and 3.27.

According to Figs. 2 and 3, there is provid-ed in the lower wall 4 o the driving mechanism a pump, vhich is designated generally g5. This pump can be constructed, for example, as an eccentric pump, and it can receive its drive from the rotatmg cylinder 23.2 (not shown).

Fig. 3 is a cross-sectional view of the hydraulic pump in accordance with lines 3'3 and 3 3 of Fi. l and Fig. 2 respectively, wherein the inner trough e is encased in an outer trough 139, the pump 95 extending into the outer trough as shown in Fig. 2.

The cylinder chamber 96 of the 95 is in communication with two connection heads 97 and 93 (Fig. 3), in each of which there is provided a bali valve $9 or d. One ball valve, acted upon by a spring, is shown Each of the ball valves is connected by pipes 101 and 192 with the intake or discharge 2i?, 2l, or 22, 23 of the driving mechanismrby way of slots it and 16.24, so that by means of the pump dependent on the direction of the traversing driving agent, fresh driving agent, and more particularly cooled and cleaned oil, can be conducted in continuous operation either through the pipe lili and slots 163 into the pipe 23, or through the pipe 102, 164 into the pipe 22. lhe supply of agent by way of the pipe 161 or itil?. depends in each case on the pressure exerted by the drivinfy agent, for example oil, either'on the ball valve 99 or on the ball valve idd, and this pressure in turn depends upon the direction in which the driving agent is moving. In this way it is ensured automatically that fresh oil or a portion of therfresh oil is conducted into the intake for the driving agent into the driving mechanism.

Fig. 5 is a diagrammatic view showing the arrangement of a pump assembly in accordance with the invention. The view shows the Vhydraulic pump, the shaft of which may be driven, for example, by an electric motor, the pump being connected by way of huid lines 23, 2d and 21, 2Q respectively to a hydraulic motor of similar construction,'the shaft of which drives a machine. Below the hydraulic pump and driven thereby is a fresh iluid pump 95 by means of which fresh fluid is sucked from a uid reservoir 13d over a suction valve 131 and forced through pipes lili, 1l2 into lines 23, 2a in the shaft of the hydraulic pump to compensate for i'luid losses. A double valve as shown in Fig. 4 may be connected by way of branch pipes i, HS either with pipes i551, 1432 or with continuations i535, 106 thereof and may also communicate by way of pipes 124, 125 with the reservoir 130 so that when the pressure of the pump 95 exceeds a certain value the surplus fluid is passed back into the reservoir 13d. Y be combined with the fresh uid pump 95.

In accordance with the quantity of fresh driving agent, and more particularly oil, supplied by the pump 95, care Y must be taken that a corresponding quantity of used driving agent, for example driving agent which has become warm by the circulation and the transfer or energy, is returned into a reservoir or treatment container.

This may be effected, for example, by the provision of anV automatically controlled double valve (Fig. 4)

in the pipes 165 and 26 on the discharge side. The pipes 105 and lit communicate by means ot a branch 167 or 108 with the valve chamber it?? of a double control valve, which is designated generally iid. in the valve chamber 19% there is mounted a piston lil, which by means of two rods 112 and 113 is connected with two valves and H5, which may be constructed, for example, as conical valves and are Vadapted to co-operate with their appertaining seats M6 and 117. The valve chambers 11S and im? are each connected by way of a pipe 120 or 121 with a spring-controlled conical valve 122 or 123, the latter having discharge passages 124, 125, by means of which Ydriving agent, for example oil,

lf desired, the double valve may also 4 can be returned into the reservoir, treatment container or the like.

The double valve (Fig. 4) may be combined in one block with the fresh uid pump as schematically indicated by dotted lines in Fig. 5 or may be inserted between the lines 105, 106 of Fig. 2. Y

The automatic control valve operates as follows:

When the pressure is prevailing in the pipe 5.05 (see Figure 4) the piston 111 in the valve chamber 109 will be moved so that the valve 114 will be lifted from its seat ile and therefore the driving agent can be discharged by the pipe 1% into the valve chamber 113 and from Ythere passes out through the outlet 124 and back into a reservoir 13G from where it can again be passed to the pump 95 by means of a valve 131, the agent opening the Yball valve 123 against its spring. During this time the valve 115 is in its closed position against the valve seat 117 as shown in Figure 4.

lf, on the other hand, the pressure should prevail in the pipe 1456 the piston 111 in the valve chamber 199 will be moved to such a position that the valve 114 seats against its seat 116 while a driving agent may enter from the branch 167 to the interior of the valve chamber 169, from there into the chamber 119 and through the pipe 12u and bacli to the reservoir 130 by opening the ball valve 122. Y

According to a preferred embodiment of the invention, the pump 95 operates in such a manner that in the complete driving' mechanism there is always a certain precompression, or in other words Va certain increased pressure in thedriving agent independently of the pressure generated by the driving mechanism itself. In this way it is accomplished that in the'case of a driving mechanism according to the invention the control parts 34, 35, 34a, 35a, etc., associated with the plungers or double plungers 15, 16, 15a, 16a, etc., exert a certain pressure on the cups 41 and 42, so that in this way the pump is practically noiseless vin operation. This is of particular advantage as regards proper operation of the driving mechanism according to the invention, as in this way the noises otherwise necessarily resulting rom'the different methods of moving the control parts are completely precluded, and accordingly silent operation of the driving mechanism is in a manner of speaking ensured from a single central point (pump 95).

The driving mechanism according to the invention is preferably intended as pump for continuously regulable variable speed transmissions, in which the driving agent, for example oil, discharged under pressure serves for discharge drive. The mechanism, however, can also be employed with equal advantage as a compressor for the most Vvaried purposes, in which, for example, a gaseous pressure agent, such as air, is compressed by means of the driving mechanism and conducted to a desired point of use, for example to the compressor vof an internal combustion engine.

A pump according to the invention is adapted for use in conjunction with both stationary as well as mobile aggregates, particularly also for the control and drive of motor vehicles, in which the pressure generated by a driving mechanism in accordance with the invention can be employed in direct fashion for driving the wheels'of a motor vehicle, suitable discharge drives being provided, for example, on the wheel axles. A construction of this nature would have in'particular the advantage that the speed of a motor vehicle can be regulated without break within desired limits by means of one single control lever, and that mechanical transmission means of any kind between the driving shaft and the driven Wheels, such as Cardan shaft, dierential gear, etc., can be fully dispensed with.

What I claim is:

1. In combination, a rotary hydraulic pump having a hollow casing into which a driven main shaft extends and spaced disc shaped support bearings extended about the main shaft and pivotally supported within the casing to turn on parallel axes extended at right angles to the shaft axis, a cylindrical casing rotatively mounted on the shaft within the hollow casing and between the pvot axes of the support bearings, said cylindrical casing having a plurality of cylindrical passageways extended parallel to and spaced about the main shaft, means iixedly mounted in said passageways intermediate to the ends thereof dividing said passageways into spaced chambers, a piston slidable in each of said chambers, means joining said piston to the support bearings, connecting means joining the piston of each passageway through said dividing means for opposed but uniform movement within their respective chambers, means for alternately supplying and discharging uid under pressure to and from the opposed chambers of each passageway to operate between the adjacent faces of the respective dividing means and said piston, pump means for supplying fresh fluid to the hydraulic pump and automatically operating means for discharging the corresponding quantity of used iiuid from the pumping circuit.

2. A pump according to claim 1, wherein rods join said support bearings for unitary pivotal movement about their pivot axes.

3. A pump according to claim 1, wherein said connecting means comprise a tubular stem on one of the pistons of each of said passay geways and slidably extended through the respective dividing means and a rod formed on the other piston of each passageway and projected into said tubular stem.

4. A pump according to claim 3, wherein said tubular stems have a snug sliding fit in said dividing means to prevent the ow of uid under pressure between Vthe chambers of each passageway through the respective dividing means.

5. A pump according to claim l, wherein the dividing means comprises bushings ixedly mounted in said passageways.

References Cited in the le of this patent UNITED STATES PATENTS 2,114,076 Golz Apr. 12, 1938 2,412,835 Robinson Dec. 17, 1946 2,601,830 Berlyn et al. July 1, 1952 FOREIGN PATENTS 17,740 Great Britain 1913 

